Basler Electric BE1-25A - Manual (Page 71)

SECTION 6
• RELAY DIFFERENCES
INTRODUCTION
This section contains information concerning previous versions of BE1-25A Auto-Synchronizer Relays.
PRODUCT DESIGN CHANGES
Synchronizer Modules are the primary control modules of the original BE1-25A Auto-Synchronizer.
However, beginning with serial number 300, a redesigned module was introduced that featured a
microprocessor. The redesigned module was renamed the MCU sync module to distinguish it from the old
module. It is theoretically possible to upgrade the original version of the BE1-25A by replacing the
synchronizer module with an MCU sync module. However, this is definitely not recommended. When a
microprocessor based synchronizer system is wanted, an entirely new unit
− with improved accessibility
and numerous other refinements
− would be the most cost-effective choice.
Because of the greater power of the MCU sync module over the original module, it was possible to
incorporate the functions of several options. Those options were the breaker time equalization options B3
and B5. In addition to these, several other former options are no longer supported in the new design.
They are the F2, F4, and V4 options. The discontinued options, B3, B5, F2, F4, and V4 are not to be used
when the new MCU sync module is installed.
Effective with BE1-25A relays, revision R and subsequent (April 30, 1996, serial number 9616002N and
later), options F1 and F3 became obsolete. Options F0 and F5 are the only frequency matching options
available. The functions of options F1 and F3 were made available as part of the F5 frequency matching
option.
The software of revision U BE1-25A relays was changed to Version 5.02. These software changes
improved the performance of the F1 and F3 types of frequency correction which are available as part of
the F5 option.
Options that are compatible with the both the new and the old versions of the BE1-25A system, are
described in the main section of the manual along with the standard modules. Those modules are the test
module, the MCU Sync module, and the power supply module. Discontinued options are described later
in this section.
The power supply was redesigned for the new series beginning with S/N 300. Both the old and new
designs of the power supply are of the switching type, and operate from the same nominal voltages.
Therefore, because this manual is not involved with minute details of the internal circuitry, no special
coverage of the old version is detailed here.
While the two power supply designs are theoretically interchangeable, any such substitution has not been
subjected to the extensive verification testing that is necessary to ensure that the published specifications
are supported. Accordingly, we strongly recommend against any reverse substitution.
CONNECTIONS
Terminals are suitable for use with wire sizes 14 AWG or larger. Incorrect wiring may result in damage to
the unit. Terminal connections for Automatic Synchronizers with serial numbers 299 and lower are
identified in Figure 6-1. Note that this diagram (unlike the diagram in Section 4 and Figure 6-2) does not
provide a ground terminal at TB2-1. Instead, a direct ground connection may be secured by any of the
rack-attachment screws. Terminal connections for Automatic Synchronizers with serial numbers 300 to
9616001N are identified in Figure 6-2.
9146600990 Rev S BE1-25A Relay Differences 6-1